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中文摘要：
高寒灌丛生态系统是广布于青藏高原的高寒草甸植被类型,它是青藏高原大气与地面之间生物地球化学循环的重要构成部分,在区域生态系统碳平衡中起着极为重要的作用。采用涡度相关法对青藏高原高寒灌丛CO2通量进行连续观测（2003年1月1日至2005年12月31日）,结果表明：2003,2004和2005年高寒灌丛年净生态系统CO2交换量分别为223,277和61g CO2.m-2.a-1,3年平均CO2值为187g CO2.m-2.a-1;与其他地区草地生态系统类型相比,在为期3年的研究时段海北地区高寒灌丛生态系统表现为大气CO2的汇。
英文摘要：
Alpine shrub ecosystem is an alpine meadow vegetation type widely distributed in the Qinghai-Tibet Plateau.It is a crucial component of biogeochemical cycles between the atmosphere and surface playing an important role of ecosystem carbon balance.Continuous CO2 flux observation using the eddy covariance method in the alpine shrub of Qinghai-Tibet Plateau indicates that the alpine shrub ecosystem was a weak sink for atmospheric CO2 with a net ecosystem CO2 exchange（NEE） capacity of 223,277 and 61 g CO2·m-2·a-1 from 2003 to 2005,respectively.Compared to other grassland ecosystems types,the alpine shrub ecosystem of Haibei area can play a role in atmospheric CO2 sinks during the tested period.
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Non-additive effect of species diversity and temperature sensitivity of mixed litter decomposition i
Field evidence for earlier leaf-out dates in alpine grassland on the eastern Tibetan Plateau from 19
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